Set edge of an object at a precise distance from another
One obvious solution seems to be snapping.

Select the road, and put 3D cursor there (Object &gt; Snap &gt; Cursor to selected)
Add &gt; Object &gt; Plane and set  it's size to 9,012 meters. Now we have a measure.
Enable snapping to Vertex &gt; Closest.
Move the rail along X axis and snap it to one corner of the 'measure' plane.
It will be exactly 9m from the center of the road.

New objects appear at 3D cursor. My plane size is 400 mm. Your's will be 9,012 m.